feat: describe matrix variables of type array of objects

[deemp]

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Why:

Partially closes: https://github.com/github/docs/issues/26469

I used this hidden knowledge in https://github.com/freckle/stack-action/pull/35 and decided to document it.

What's being changed (if available, include any code snippets, screenshots, or gifs):

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[nguyenalex836]

@deemp Thanks so much for opening a PR! I'll get this triaged for review ✨

[nguyenalex836]

Hi @deemp 👋 ! Please let us know your thoughts regarding @jc-clark's last response 💛

[deemp]

@jc-clark, @nguyenalex836, thanks for a review. I believe these node versions are OK.

The point of this example was to demonstrate how a matrix unwraps into multiple job configurations. If you think an example without specific node versions is more maintainable, feel free to use something instead of node.

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